Why can I not access certain web sites?

To visit some website you have to be over 18 :)

http://www.designsimpleweb.com

My solution to this problem was very simple (after I spent hours trying to figure it out). One would think that the Tools -> Internet Options pulldown in Internet Explorer only applies only to IE--however, it applies (apparently) to all browsers on the system, as I found out. The solution was to reset the settings there back to their defaults by going through each tab in turn and clicking anything that looks like "reset to defaults...". I could not access a certain page in either Firefox or IE, but after I did this simple step, it started working in both browsers. Another unexpected but positive side effect of this was that I experienced a noticeable performance improvement in general. Moral: it's amazing what data can corrupt over time, even if you don't explicitly change any settings on your system.

And don't forget to reboot your network equipment and your web browser after making the browser changes above.

HELP.. my new wireless router wont allow me to access hotmail msn and a whole lot of other pages. My little old semiens modem works just fine!! what am i doing wrong

hey.i got a loptop with window vista but i cant access certain websites either the wierd thing is that i could get on those sites for couple of days but not now anymore so what could be the issue 'n how to solve it...thanx

I am not able to access any google site that I have previously visited, i.e. Gmail, maps, google search, etc. The internet browser doesn't open them. However, some google pages that I did not visited before can be open, i.e. videos, news, etc.
I uninstalled a websync program from google when i was trying to clean my computer. Do you think is this the reason? What can I do to get this fixed as I use gmail quite much.

Thanks, V.

The items above do not quite address this problem. Two months ago, some web sites became inaccessible, and now it is random, sometimes the ones that were not are, but it is never consistent, and sometimes takes a lot of work,i.e. over and over again using a little different techniques and finally hitting the site, though some are not accessible at all). This computer is used for business only. Using Windows XP2 (upgraded to V.2), cable modem connected to router. Have tried everything, uninstalled Norton Antivirus and Norton Firewall (expired not long before these problems began), installed new antivirus Avast!, got a new cable modem, cleaned out browser history, cookies, temp files (am doing this sometimes twice a day to access certain secure sites such as banks), using AOL for email, and the browser, also using IE7 browser, usually when AOL's doesn't work, but IE7 also sometimes doesn't work (see above), have talked with AOL, one of the Banks' online support people, and Dell (Dell wants me to reformat harddrive again,this was done 1-1/2 years ago and am trying to avoid this). Unplug the router and modem, restart the computer, all the secure settings are checked in IE7 InternetOptions Advanced, tried resetting IE Internet settings to default, am adding secure sites to Trusted zone which is set to Low, set Internet settings to "never dialup a connection". Will try the suggestion for the MTU, but have High speed cable connection. What is the next step?

Adding on to the previous, have also tried Modzilla, with no improvement. This is a critical issue for the business.

I could not access one wibsite in home. I used 3 different computers, all were the same. but I could get the wibsite with the same computer in my office. So I guess it is not the computer problem. I contacted the internet provider, verizon fiber optic, it said that my ip is blocked by the website. I contacted the wibsite management, the wibsite said it does not block anybody. do you know what is going on?

I comment on many sites (blogs) out of the blue there is one I have always posted to that I can no longer. It's almost a read only. Any thoughts?